﻿/**
 * Timeago is a jQuery plugin that makes it easy to support automatically
 * updating fuzzy timestamps (e.g. "4 minutes ago" or "about 1 day ago").
 *
 * @name timeago
 * @version 1.1.0
 * @requires jQuery v1.2.3+
 * @author Ryan McGeary
 * @license MIT License - http://www.opensource.org/licenses/mit-license.php
 *
 * For usage and examples, visit:
 * http://timeago.yarp.com/
 *
 * Copyright (c) 2008-2013, Ryan McGeary (ryan -[at]- mcgeary [*dot*] org)
 */

(function (factory)
{
	if (typeof define === 'function' && define.amd)
	{
		// AMD. Register as an anonymous module.
		define(['jquery'], factory);
	} else
	{
		// Browser globals
		factory(jQuery);
	}
}(function ($)
{
	$.timeago = function (timestamp)
	{
		if (timestamp instanceof Date)
		{
			return inWords(timestamp);
		} else if (typeof timestamp === "string")
		{
			return inWords($.timeago.parse(timestamp));
		} else if (typeof timestamp === "number")
		{
			return inWords(new Date(timestamp));
		} else
		{
			return inWords($.timeago.datetime(timestamp));
		}
	};
	var $t = $.timeago;

	$.extend($.timeago, {
		settings: {
			refreshMillis: 60000,
			allowFuture: false,
			strings: {
				prefixAgo: null,
				prefixFromNow: null,
				suffixAgo: "ago",
				suffixFromNow: "from now",
				seconds: "less than a minute",
				minute: "about a minute",
				minutes: "%d minutes",
				hour: "about an hour",
				hours: "about %d hours",
				day: "a day",
				days: "%d days",
				month: "about a month",
				months: "%d months",
				year: "about a year",
				years: "%d years",
				wordSeparator: " ",
				numbers: []
			}
		},
		inWords: function (distanceMillis)
		{
			var $l = this.settings.strings;
			var prefix = $l.prefixAgo;
			var suffix = $l.suffixAgo;
			if (this.settings.allowFuture)
			{
				if (distanceMillis < 0)
				{
					prefix = $l.prefixFromNow;
					suffix = $l.suffixFromNow;
				}
			}

			var seconds = Math.abs(distanceMillis) / 1000;
			var minutes = seconds / 60;
			var hours = minutes / 60;
			var days = hours / 24;
			var years = days / 365;

			function substitute(stringOrFunction, number)
			{
				var string = $.isFunction(stringOrFunction) ? stringOrFunction(number, distanceMillis) : stringOrFunction;
				var value = ($l.numbers && $l.numbers[number]) || number;
				return string.replace(/%d/i, value);
			}

			var words = seconds < 45 && substitute($l.seconds, Math.round(seconds)) ||
			  seconds < 90 && substitute($l.minute, 1) ||
			  minutes < 45 && substitute($l.minutes, Math.round(minutes)) ||
			  minutes < 90 && substitute($l.hour, 1) ||
			  hours < 24 && substitute($l.hours, Math.round(hours)) ||
			  hours < 42 && substitute($l.day, 1) ||
			  days < 30 && substitute($l.days, Math.round(days)) ||
			  days < 45 && substitute($l.month, 1) ||
			  days < 365 && substitute($l.months, Math.round(days / 30)) ||
			  years < 1.5 && substitute($l.year, 1) ||
			  substitute($l.years, Math.round(years));

			var separator = $l.wordSeparator || "";
			if ($l.wordSeparator === undefined) { separator = " "; }
			return $.trim([prefix, words, suffix].join(separator));
		},
		parse: function (iso8601)
		{
			var s = $.trim(iso8601);
			s = s.replace(/\.\d+/, ""); // remove milliseconds
			s = s.replace(/-/, "/").replace(/-/, "/");
			s = s.replace(/T/, " ").replace(/Z/, " UTC");
			s = s.replace(/([\+\-]\d\d)\:?(\d\d)/, " $1$2"); // -04:00 -> -0400
			return new Date(s);
		},
		datetime: function (elem)
		{
			var iso8601 = $t.isTime(elem) ? $(elem).attr("datetime") : $(elem).attr("title");
			return $t.parse(iso8601);
		},
		isTime: function (elem)
		{
			// jQuery's `is()` doesn't play well with HTML5 in IE
			return $(elem).get(0).tagName.toLowerCase() === "time"; // $(elem).is("time");
		}
	});

	// functions that can be called via $(el).timeago('action')
	// init is default when no action is given
	// functions are called with context of a single element
	var functions = {
		init: function ()
		{
			var refresh_el = $.proxy(refresh, this);
			refresh_el();
			var $s = $t.settings;
			if ($s.refreshMillis > 0)
			{
				setInterval(refresh_el, $s.refreshMillis);
			}
		},
		update: function (time)
		{
			$(this).data('timeago', { datetime: $t.parse(time) });
			refresh.apply(this);
		}
	};

	$.fn.timeago = function (action, options)
	{
		var fn = action ? functions[action] : functions.init;
		if (!fn)
		{
			throw new Error("Unknown function name '" + action + "' for timeago");
		}
		// each over objects here and call the requested function
		this.each(function ()
		{
			fn.call(this, options);
		});
		return this;
	};

	function refresh()
	{
		var data = prepareData(this);
		if (!isNaN(data.datetime))
		{
			$(this).text(inWords(data.datetime));
		}
		return this;
	}

	function prepareData(element)
	{
		element = $(element);
		if (!element.data("timeago"))
		{
			element.data("timeago", { datetime: $t.datetime(element) });
			var text = $.trim(element.text());
			if (text.length > 0 && !($t.isTime(element) && element.attr("title")))
			{
				element.attr("title", text);
			}
		}
		return element.data("timeago");
	}

	function inWords(date)
	{
		return $t.inWords(distance(date));
	}

	function distance(date)
	{
		return (new Date().getTime() - date.getTime());
	}

	// fix for IE6 suckage
	document.createElement("abbr");
	document.createElement("time");
}));
